WO2017054408A1 - 像素驱动电路、显示面板及其驱动方法和显示装置 - Google Patents

像素驱动电路、显示面板及其驱动方法和显示装置 Download PDF

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Publication number
WO2017054408A1
WO2017054408A1 PCT/CN2016/075117 CN2016075117W WO2017054408A1 WO 2017054408 A1 WO2017054408 A1 WO 2017054408A1 CN 2016075117 W CN2016075117 W CN 2016075117W WO 2017054408 A1 WO2017054408 A1 WO 2017054408A1
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WIPO (PCT)
Prior art keywords
node
transistor
voltage
driving
signal
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Ceased
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PCT/CN2016/075117
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English (en)
French (fr)
Inventor
杨盛际
董学
薛海林
王海生
陈小川
刘红娟
孙拓
马利飞
刘英明
赵卫杰
李昌峰
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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Application filed by BOE Technology Group Co Ltd, Beijing BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US15/309,316 priority Critical patent/US9965097B2/en
Priority to EP16782174.3A priority patent/EP3358560A4/en
Publication of WO2017054408A1 publication Critical patent/WO2017054408A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, a display panel, a driving method thereof, and a display device.
  • an organic light emitting diode is a current type light emitting device because of its self-luminous, fast response, wide viewing angle, and can be fabricated on a flexible substrate. It is increasingly used in the field of high performance display.
  • OLED display devices can be classified into passive matrix driven organic light emitting diodes (Passive Matrix Driving OLEDs, PMOLEDs) and active matrix driven organic light emitting diodes (AMOLEDs) according to different driving methods. Because AMOLED displays have low manufacturing cost and high response speed. Power saving, DC drive for portable devices, large operating temperature range, etc., is expected to become the next generation of new flat panel displays that replace liquid crystal displays (LCDs).
  • LCDs liquid crystal displays
  • OLEDs are driven by a driving transistor (DriveThin Film Transistor, DTFT), which is usually a P-type switching transistor.
  • the gate of the DTFT is connected to the data input terminal V data
  • the source is connected to the constant voltage input terminal V DD
  • the drain is connected to the OLED.
  • the threshold voltage Vth of the DTFT affects the driving current I OLED flowing through the OLED, and the threshold voltage V of the DTFT in each pixel unit is caused by manufacturing process errors, device aging, and the like.
  • the drift of th causes a deviation in the driving current flowing through the OLED, thereby affecting the display effect.
  • display devices with touch functions have gradually gained popularity among more and more people due to their visual operations and the like.
  • the cathode of the OLED in the OLED display device is multiplexed into a touch electrode, which can reduce the overall thickness of the display device.
  • the touch driving signal needs to be applied to the cathode. Since the voltage of the touch driving signal changes with time, the current flowing through the OLED changes, and the brightness of the OLED changes with time. , affecting the light display.
  • Embodiments of the present disclosure provide a pixel driving circuit, a display panel, a driving method thereof, and a display device, which can avoid the influence of a threshold voltage drift of a driving transistor on a driving current of an active light emitting device while avoiding a voltage of a touch driving signal with time. The effect of changes on the display effect.
  • a pixel driving circuit includes: a presetting unit, a driving unit, a compensation unit, an energy storage unit, and a driving signal output unit, wherein
  • the energy storage unit is connected to the first node and the second node, and is configured to store voltages of the first node and the second node;
  • the presetting unit is connected to the first voltage end, the first node, the second node, the second scanning signal end and the reset signal end, and is configured to, under the control of the second scanning signal end, the voltage of the first voltage end Writing to the first node, and writing a voltage of the reset signal end to the second node;
  • the compensation unit is connected to the third node, the first node, the second node, the data signal end and the first scan signal end, and is configured to write the data voltage of the data signal end under the control of the first scan signal end Describe a first node, and write a voltage of the third node to the second node until the voltage of the second node is compensated as a difference between a voltage of the first voltage terminal and a threshold voltage of the driving unit;
  • the driving unit is connected to the first voltage terminal, the second node and the third node, and is configured to output to the third node for driving at a voltage of the first voltage terminal and a voltage of the second node Driving current of the electroluminescent element to which the pixel driving circuit is connected;
  • the driving signal output unit is connected to the first node, the third node, the reference signal end, the third scan signal end, and the signal output end, and is configured to transmit the signal of the reference signal end under the control of the third scan signal end Writing to the first node and outputting a driving current of the third node to the signal output terminal.
  • the preset unit includes: a first transistor and a fourth transistor, wherein
  • a gate of the first transistor is connected to the second scan signal end, a first end of the first transistor is connected to the first voltage end, and a second end of the first transistor is connected to the first node ;as well as
  • a gate of the fourth transistor is connected to the second scan signal end, a first end of the fourth transistor is connected to the reset signal end, and a second end of the fourth transistor is connected to the second node .
  • the energy storage unit includes: a first capacitor, wherein
  • the first end of the first capacitor is connected to the first node, and the second end of the first capacitor is connected to the second node.
  • the driving unit comprises: a driving transistor, wherein
  • a gate of the driving transistor is connected to the second node, a first end of the driving transistor is connected to the first level terminal, and a second end of the driving transistor is connected to the third node.
  • the compensation unit includes: a third transistor and a fifth transistor, wherein
  • a gate of the third transistor is connected to the first scan signal end, a first end of the third transistor is connected to the data signal end, and a second end of the third transistor is connected to the first node; as well as
  • a gate of the fifth transistor is connected to the first scan signal end, a first end of the fifth transistor is connected to the third node, and a second end of the fifth transistor is connected to the second node.
  • the driving signal output unit includes: a second transistor and a sixth transistor, wherein
  • a gate of the second transistor is connected to the third scan signal end, a first end of the second transistor is connected to the reference signal end, and a second end of the second transistor is connected to the first node; as well as
  • the gate of the sixth transistor is connected to the third scan signal end, the first end of the sixth transistor is connected to the third node, and the second end of the sixth transistor is connected to the signal output end.
  • a display panel includes: a substrate, an array of electroluminescent elements formed on the substrate, a pixel driving circuit array for driving the respective electroluminescent elements, and a housing for The pixel driving circuit array provides a plurality of display driving signal lines for displaying driving signals, wherein
  • a pixel driving circuit in the pixel driving circuit array is any one of the above-mentioned driving circuits;
  • the electroluminescent element array includes a first electrode pattern, a second electrode pattern, and the first electrode pattern and the first An electroluminescent layer between the two electrode patterns; and
  • the first electrode pattern includes a plurality of first electrodes, each of the first electrodes corresponding to a signal output end of a pixel driving circuit.
  • the display panel further includes a plurality of touch signal lines
  • the second electrode pattern includes a plurality of second electrodes, each of the second electrodes is connected to a touch signal line, and is suitable as a touch electrode.
  • each of the second electrodes in the second electrode pattern is divided into a plurality of rows, and the second electrodes of the odd rows and the second electrodes of the even rows are staggered in the column direction; each of the second electrodes of the odd rows of each The second touch electrodes are connected to the same touch signal line; and the second electrodes in the same column of the second rows of the even rows are connected to the same touch signal line.
  • the first electrode is the anode of the electroluminescent element and the second electrode is the cathode of the electroluminescent element.
  • a driving method of a display panel as described above including:
  • the preset unit writes the voltage of the first voltage terminal to the first node under the control of the second scan signal end, and writes the voltage of the reset signal terminal to the second node;
  • the compensation unit writes the data voltage of the data signal end to the first node under the control of the first scan signal end, and writes the voltage of the third node to the second node until the voltage compensation of the second node is performed.
  • the driving signal output unit writes the signal of the reference signal end to the first node under the control of the third scanning signal end, and the voltage of the driving unit at the first voltage end Controlling, by the voltage of the second node, outputting a driving current for driving the electroluminescent element connected to the pixel driving circuit to the third node; and driving the signal output unit to output the driving current of the third node to the signal output end, among them
  • the third stage includes a touch period in which a touch driving signal is applied on the second electrode in the second electrode pattern, wherein the display driving signal applied on each of the display driving signal lines is displayed The difference between the voltage and the voltage of the touch drive signal applied to the touch signal line does not change with time.
  • the preset unit includes: a first transistor and a fourth transistor, wherein
  • the first transistor and the fourth transistor are both in an on state under the control of the second scan signal terminal, and the voltage of the first voltage terminal is written into the first node through the first transistor, and is heavy The voltage at the signal terminal is written to the second node through the fourth transistor.
  • the compensation unit includes: a third transistor and a fifth transistor, wherein
  • the third transistor and the fifth transistor are both in an on state under the control of the first scanning signal terminal, and the data voltage of the data signal terminal is written into the first node through the third transistor, and the first The voltage of the three nodes is written to the second node through the fifth transistor until the voltage of the second node is compensated to be the difference between the voltage of the first voltage terminal and the threshold voltage of the driving unit.
  • the driving signal output unit includes: a second transistor and a sixth transistor, wherein
  • the second transistor and the sixth transistor are both in an on state under the control of the third scan signal end, and the signal at the reference signal end is written into the first node through the second transistor, and the third The driving current of the node is output to the signal output terminal through the sixth transistor.
  • a display device includes the above display panel.
  • Embodiments of the present disclosure provide a pixel driving circuit, a display panel, a driving method thereof, and a display device. Since the compensation unit can perform threshold voltage compensation on the driving unit, the threshold voltage drift of the driving unit in the pixel driving circuit is prevented from causing a driving current and a current.
  • the effect of applying a touch driving signal on the second electrode in the second electrode pattern during the touch period; and displaying in each strip when driving the display panel including the pixel driving circuit described above The difference between the voltage of the display driving signal applied by the driving signal line and the voltage of the touch driving signal does not change with time, thereby avoiding the influence of the voltage of the touch driving signal with time on the display effect.
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a connection relationship between a second electrode and a touch signal line in the display panel shown in FIG. 2 according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure.
  • FIG. 5 is a timing diagram of input signals of the pixel driving circuit shown in FIG. 4 according to an embodiment of the present disclosure
  • FIG. 6 is an equivalent circuit diagram of the pixel driving circuit shown in FIG. 4 at the t1 stage according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of an equivalent circuit of the pixel driving circuit shown in FIG. 4 at the stage t2 according to an embodiment of the present disclosure
  • FIG. 8 is an equivalent circuit diagram of the pixel driving circuit shown in FIG. 4 at the t3 stage according to an embodiment of the present disclosure.
  • Substrate-10 buffer layer-11, active layer-12; doped active layer-12a (12b), gate insulating layer-13, gate-14, interlayer insulating layer-15, drain-16a, Source-16b, touch signal line-16c, planarization layer-17, first electrode-18a, third electrode-18b, pixel defining layer-19, electroluminescent layer-20, second electrode-21, pixel Drive circuit -30;
  • the transistors employed in all embodiments of the present disclosure may each be a thin film transistor or a field effect transistor or other device having the same characteristics, and the transistors employed in the embodiments of the present disclosure are mainly switching transistors according to the functions in the circuit. Since the source and drain of the switching transistor used here are symmetrical, the source and the drain are interchangeable. In the embodiment of the present disclosure, in order to distinguish the two poles of the transistor except the gate, the source is referred to as a first end, and the drain is referred to as a second end. According to the form in the drawing, the middle end of the transistor is the gate, the signal input end is the source, and the signal output end is the drain.
  • the switching transistor used in the embodiment of the present disclosure includes a P-type switching transistor and an N-type switching transistor, wherein the P-type switching transistor is turned on when the gate is at a low level, and is turned off when the gate is at a high level, and the N-type switching transistor is turned off.
  • the driving transistor includes P type And an N-type, wherein the P-type driving transistor is in an amplified state or a saturated state when the gate voltage is low (the gate voltage is less than the source voltage) and the absolute value of the gate-source voltage difference is greater than the threshold voltage;
  • the gate voltage of the N-type driving transistor is at a high level (the gate voltage is greater than the source voltage) and the absolute value of the voltage difference of the gate source is greater than the threshold voltage, it is in an amplified state or a saturated state.
  • an embodiment of the present disclosure provides a pixel driving circuit, including: a preset unit 101, a driving unit 102, a compensation unit 103, an energy storage unit 104, and a driving signal output unit 105, wherein
  • the energy storage unit 104 is connected to the first node a and the second node b for storing voltages of the first node a and the second node b;
  • the preset unit 101 is connected to the first voltage terminal V1, the first node a, the second node b, the second scan signal terminal S2 and the reset signal terminal INT for using the first scanning signal terminal S2.
  • the voltage of the voltage terminal V1 is written to the first node a, and the voltage of the reset signal terminal INT is written to the second node b;
  • the compensation unit 103 is connected to the third node c, the first node a, the second node b, the data signal end Data and the first scan signal terminal S1 for data of the data signal end Data under the control of the first scan signal terminal S1. Writing a voltage to the first node a and writing a voltage of the third node c to the second node b until the voltage of the second node b is compensated for the voltage of the first voltage terminal V1 and the threshold of the driving unit 12 The difference in voltage;
  • the driving unit 102 is connected to the first voltage terminal V1, the second node b and the third node c for outputting to the third node c under the control of the voltage of the first voltage terminal V1 and the voltage of the second node b for Driving a driving current of the electroluminescent element connected to the pixel driving circuit;
  • the driving signal output unit 105 is connected to the first node a, the third node c, the reference signal terminal REF, the third scanning signal terminal S3 and the signal output terminal OUT for controlling the reference signal terminal REF under the control of the third scanning signal terminal S3.
  • the signal is written to the first node a, and the drive current of the third node c is output to the signal output terminal OUT.
  • Embodiments of the present disclosure provide a display panel including a substrate, an array of electroluminescent elements formed on the substrate, a pixel driving circuit array for driving the respective electroluminescent elements, and a display driving signal for providing the pixel driving circuit array Multiple display drive signal lines;
  • the pixel driving circuit in the pixel driving circuit array is a pixel driving circuit as described above;
  • the electroluminescent element array includes a first electrode pattern, a second electrode pattern, and an electroluminescent layer disposed between the first electrode pattern and the second electrode pattern
  • the first electrode pattern includes a plurality of first electrodes, each of the first electrodes corresponding to a signal output end of a pixel driving circuit;
  • the display panel further includes a plurality of touch signal lines, and the second electrode pattern includes a plurality of second electrodes, each of the second electrodes being connected to a touch signal line, which is suitable as a touch electrode.
  • each of the second electrodes in the second electrode pattern is divided into a plurality of rows, and the second electrodes of the odd rows and the second electrodes of the even rows are staggered in the column direction; the respective second electrodes of the odd rows of each are connected to The same touch signal line; each of the second electrodes in the same column of the second rows of the even rows is connected to the same touch signal line.
  • An embodiment of the present disclosure further provides a driving method of a display panel as described above, including the following three stages:
  • the preset unit writes the voltage of the first voltage terminal to the first node under the control of the second scan signal end, and writes the voltage of the reset signal terminal to the second node;
  • the compensation unit writes the data voltage of the data signal end to the first node under the control of the first scanning signal end, and writes the voltage of the third node to the second node until the voltage of the second node is compensated to the first The difference between the voltage at the voltage terminal and the threshold voltage of the driving unit;
  • the driving signal output unit writes the signal of the reference signal end to the first node under the control of the third scanning signal end, and the driving unit outputs the voltage to the third node under the voltage control of the first node and the voltage of the second node.
  • the third stage includes a touch period in which a touch driving signal is applied to the second electrode in the second electrode pattern; wherein the voltage of the display driving signal applied to each of the display driving signal lines and the touch applied on the touch signal line The difference in voltage of the control drive signal does not change with time.
  • the third stage drives the electroluminescent element to emit light, and the third stage includes a touch period.
  • the touch period in the third stage is displayed in each strip.
  • the driving signal lines respectively correspond to the respective signal terminals connected to the pixel driving circuit, and the voltages of the corresponding display driving signals are applied to the respective display driving signal lines.
  • the difference between the voltages of the touch driving signals applied by the touch driving signal lines applied by the touch signal lines is a constant value.
  • the display driving signal applied on each display driving signal line may have a certain voltage fluctuation, and the voltage fluctuation is synchronized with the voltage change of the touch driving signal applied to the second electrode.
  • the amplitude of the fluctuation voltage is the same as the voltage change of the touch driving signal, so that the difference between the voltage of the display driving signal and the voltage of the touch driving signal is a constant value, thereby avoiding the second electrode and each display driving signal
  • the change in capacitance of the line ensures that the third stage pixel drive circuit outputs a constant drive current to the electroluminescent element.
  • the compensation unit can perform threshold voltage compensation on the driving unit, the influence of the threshold voltage drift of the driving unit in the pixel driving circuit on the driving current is avoided, and the second electrode is applied on the second electrode pattern in the touch period.
  • Touch driving signal and when driving the display panel including the pixel driving circuit described above, the difference between the voltage of the display driving signal applied on each of the display driving signal lines and the voltage on the touch driving signal does not change with time The change, therefore, avoids the influence of the voltage of the touch drive signal over time on the display effect.
  • the specific structure of the foregoing display panel may be various, for example, the pixel driving circuit may be represented in a plurality of different forms, and specific driving methods are also different. An example will be described below with reference to the accompanying drawings.
  • the electroluminescent unit array on the display panel comprises a plurality of electroluminescent elements, and the corresponding first electrode pattern of the electroluminescent unit array comprises a corresponding number of first electrodes, each electroluminescent element
  • the first electrode is connected to a pixel driving circuit, and is driven by the pixel driving circuit to perform light-emitting display.
  • One electroluminescent element and one pixel driving circuit form one pixel unit; and another control pixel is formed on the display panel.
  • FIG. 2 is a schematic structural diagram of a pixel unit of a display panel provided by the present disclosure, including: a substrate 10 formed on the substrate 10 The first electrode 18a, the second electrode 21, and the electroluminescent layer 20 between the first electrode 18a and the second electrode 21. The first electrode 18a cooperates with the second electrode 21 and the electroluminescent layer 20 above it to achieve electroluminescence.
  • the pixel unit further includes a pixel driving circuit 30 connected to the first electrode 18a, wherein only the structure of one transistor (transistor connected to the electroluminescent device) in the pixel driving circuit is shown in FIG. It can be understood that other devices of the pixel driving circuit can be fabricated on the substrate 10 by using an existing patterning process.
  • the transistor is a top gate transistor including an active layer 12 and a doped active layer 12a. 12b, gate insulating layer 13, gate 14, interlayer insulating layer 15, drain 16a, source 16b. Further, a buffer layer 11, a touch signal line 16c connected to the second electrode 21, a planarization layer 17, and a pixel defining layer 19 are also shown in FIG.
  • the planarization layer 17 is further provided with a third electrode 18b connected to the touch signal line 16c through the via hole, wherein the first electrode 18a is connected to the drain 16a through the via hole on the planarization layer 17, and the second electrode 21
  • the via hole of the pixel defining layer 19 is connected to the third electrode 18b.
  • the first electrode 18a and the third electrode 18b are formed in the same layer, and the drain electrode 16a, the source electrode 16b and the touch signal line 16c are formed in the same layer. Referring to FIG.
  • each of the second electrodes 21 and the touch signal lines 16c in the second electrode pattern the positions of the second electrodes 21 of the odd rows and the second electrodes 21 of the even rows are interleaved, each in an odd number of rows.
  • Each of the second electrodes 21 is connected to the touch signal lines 16c in the same row direction, and each of the second electrodes 21 of each of the even rows is connected to the touch signal lines 16c in the same column direction. on.
  • each of the second electrodes 21 adjacent to the position including the second electrode 21 connected to the touch signal line 16c in the column direction and connected to the row direction
  • the charge stored on the second electrode 21) on the touch signal line 16c is changed, and such a change can be detected by the touch signal line 16c connected to the second electrodes 21, thereby determining the touch position.
  • the first electrode 18a herein is the anode of the electroluminescent element and the second electrode 21 is the cathode of the electroluminescent element.
  • the cathode of the electroluminescent element array as the touch electrode, it is possible to avoid separately forming the touch electrode, which is advantageous for reducing the thickness of the display device.
  • the touch signal lines herein can be simultaneously fabricated when manufacturing various components (such as capacitors, transistors, etc.) in the pixel driving circuit.
  • the pixel driving circuit and the first electrode pattern and the electroluminescent layer may be fabricated on the back plate, and the second electrode pattern may be formed on the cover plate, and the touch signal may be The line is made on the back panel.
  • the pixel driving circuit 30 includes a total of six P-type switching transistors T1 and T6, and a P-type driving transistor DTFT and a capacitor C.
  • the pixel driving circuit 30 is connected to the anode of the electroluminescent element OLED.
  • the above display panel includes: a signal line that provides a signal to each signal terminal.
  • the presetting unit 101 includes: a first transistor T1 and a fourth transistor T4;
  • the gate of the first transistor T1 is connected to the second scan signal terminal S2, the first end of the first transistor T1 is connected to the first voltage terminal V1, the second end of the first transistor T1 is connected to the first node a; the gate of the fourth transistor T4 The second terminal of the fourth transistor T4 is connected to the INT, and the second end of the fourth transistor T4 is connected to the second node b.
  • the energy storage unit 104 includes: a first capacitor C;
  • the first end of the first capacitor C is connected to the first node a, and the second end of the first capacitor C is connected to the second node b.
  • the driving unit 12 includes: a driving transistor DTFT;
  • the gate of the driving transistor DTFT is connected to the second node b, the first end of the driving transistor DTFT is connected to the first level terminal V1, and the second end of the driving transistor DTFT is connected to the third node c.
  • the compensation unit 103 includes: a third transistor T3 and a fifth transistor T5;
  • the gate of the third transistor T3 is connected to the first scan signal terminal S1, the first end of the third transistor T3 is connected to the data signal terminal Data, the second end of the third transistor T3 is connected to the first node a; the gate of the fifth transistor T5 The first scan signal terminal S1 is connected, the first end of the fifth transistor T5 is connected to the third node c, and the second end of the fifth transistor T5 is connected to the second node b.
  • the driving signal output unit 105 includes: a second transistor T2 and a sixth transistor T6;
  • the gate of the second transistor T2 is connected to the third scan signal terminal S3, the first end of the second transistor T2 is connected to the reference signal terminal REF, the second end of the second transistor T2 is connected to the first node a; the gate of the sixth transistor T6
  • the third scan signal terminal S3 is connected, the first end of the sixth transistor T6 is connected to the third node c, and the second end of the sixth transistor T6 is connected to the signal output terminal OUT.
  • the driving method of the display panel further includes the following manners:
  • the preset unit includes: a first transistor and a fourth transistor;
  • the first transistor and the fourth transistor are both in an on state under the control of the second scanning signal terminal, and the voltage of the first voltage terminal is written into the first node through the first transistor, and the voltage of the reset signal terminal is passed through Four transistors are written to the second node;
  • the compensation unit includes: a third transistor and a fifth transistor;
  • the third transistor and the fifth transistor are both in an on state under the control of the first scanning signal end, and the data voltage of the data signal end is written into the first node through the third transistor, and the voltage of the third node is passed through Writing a fifth transistor to the second node until the voltage of the second node is compensated to be the difference between the voltage of the first voltage terminal and the threshold voltage of the driving unit;
  • the driving signal output unit includes: a second transistor and a sixth transistor;
  • the second transistor and the sixth transistor are both in an on state under the control of the third scanning signal end, and the signal of the reference signal end is written into the first node through the second transistor, and the driving current of the third node is passed through the sixth The transistor is output to the signal output.
  • the pixel driving circuit in the display panel provided by the embodiment of the present disclosure can avoid the influence of the threshold drift of the driving transistor on the light emitting display and can avoid the influence of the touch driving signal applied on the cathode on the light emitting display by a suitable driving method.
  • the working principle of the pixel driving circuit in FIG. 4 will be described below with reference to FIGS. 5-8.
  • each transistor is a "P" type transistor as an example.
  • the V1 terminal is a high level VDD signal
  • the signal output terminal OUT is connected to an anode of an electroluminescent device (taking an OLED as an example), and the cathode of the electroluminescent device.
  • the connected V2 terminal is low VSS.
  • FIG. 5 is a schematic diagram showing the timing state of the input signal of the pixel driving circuit provided by FIG. 5, and referring to the equivalent circuit diagram of the working state of each stage of the pixel driving circuit provided in FIGS.
  • the display panel is The working principle is divided into four parts, which are the preset stage of the first stage t1, the threshold voltage of the second stage t2 and the data writing stage, and the third stage t3 is the lighting stage, wherein the t3 stage includes the ⁇ t touch period.
  • the following embodiments are specifically described in conjunction with the equivalent circuit diagrams shown in FIGS. 6-8.
  • solid lines indicate the transistors and lines that are turned on, and broken lines indicate the transistors and lines that are not turned on.
  • S1 and S3 are high voltage cutoff signals, and S2 is a low voltage turn-on signal state.
  • T1 and T4 are turned on, and node b resets the voltage to Vint through the reset signal terminal INT, and the voltage of the node a is reset to VDD.
  • Capacitor C then maintains the voltage difference between node a and node b. Since Vint is low, the DTFT is turned on, and since capacitor C can maintain the voltage difference between node a and node b, the DTFT is in the beginning of the next phase.
  • the pass state prepares for threshold compensation.
  • S2 and S3 are high voltage cutoff signals, and S1 is a low voltage turn-on signal state.
  • T3 and T5 are turned on, and the data signal terminal Data charges node a through T3 until the voltage change of node a is Vdata.
  • T5 is turned on, the gate and drain of DTFT are short-circuited to correspond to the diode, and the potential of point b is The charge is VDD-Vth (satisfying the voltage difference between the DTTF gate and source is Vth), at which time the potential difference across the capacitor C is VDD-Vth-Vdata and is ready for the next stage.
  • S1 and S2 are high voltage cutoff signals, and S3 is a low voltage turn-on signal state.
  • T2 and T6 are turned on, the reference signal terminal REF charges the node a with the value Vref, and the node b generates a voltage jump to VDD-Vth-Vdata+Vref.
  • t3 is the formal illumination phase of the pixel, and the light-emitting phase DTFT at this time.
  • the source voltage is VDD, and the current through the DTFT and T6 causes the OLED to begin to emit light.
  • the DTFT saturation current formula can be obtained:
  • I OLED K(V GS -V th ) 2
  • the cathode electrode the second electrode or the touch electrode
  • the other display driving signal lines and the touch electrode are driven together to ensure that the original All TFT switches remain in their original switching state.
  • it does not affect the size of the OLED output current, because the data signal has been written during the whole illuminating phase at point a, since the VDD voltage and the voltage of other display driving signal lines all jump with the touch driving signal of the touch electrode, including Vint.
  • the voltage, point a is in the floating state, and will also jump along the Vint point. Therefore, there is no influence on the current I OLED outputted at the end.
  • each transistor as a P-type transistor in this embodiment can reduce the manufacturing difficulty, but in practical applications, the types of the above transistors can be adjusted to some extent, and the corresponding technical solutions can also be achieved.
  • the basic purpose of the disclosure is to fall within the scope of the present disclosure.
  • the present disclosure also provides a display device comprising the display substrate of any of the above.
  • the display device here can be: electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator and the like with any display product or component.

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Abstract

一种像素驱动电路（30）、显示面板及其驱动方法和显示装置。该像素驱动电路（30）包括：预置单元（101）、驱动单元（102）、补偿单元（103）、储能单元（104）和驱动信号输出单元（105）。

Description

像素驱动电路、显示面板及其驱动方法和显示装置
相关申请的交叉引用
本申请主张在2015年9月28日在中国提交的中国专利申请号No.201510628000.0的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示技术领域，尤其涉及一种像素驱动电路、显示面板及其驱动方法和显示装置。
背景技术
相对于现有的显示装置而言，有机发光二极管(OrganicLightEmittingDiode，OLED)作为一种电流型发光器件，因其所具有的自发光、快速响应、宽视角和可制作在柔性衬底上等特点而越来越多地被应用于高性能显示领域当中。OLED显示装置按照驱动方式的不同可分为无源矩阵驱动有机发光二极管(PassiveMatrixDrivingOLED，PMOLED)和有源矩阵驱动有机发光二极管(ActiveMatrixDrivingOLED，AMOLED)两种，由于AMOLED显示器具有低制造成本、高应答速度、省电、可用于便携式设备的直流驱动、工作温度范围大等等优点而可望成为取代液晶显示器(1iquidcrystaldisplay，LCD)的下一代新型平面显示器。
目前OLED是通过一个驱动晶体管(DriveThinFilmTransistor，DTFT)进行驱动，DTFT通常是P型的开关管。DTFT的栅极连接数据输入端Vdata，源极连接恒压的电源输入端VDD，漏极连接OLED。由源极的VDD与栅极的Vdata之间产生电压差VGS，从而使得DTFT漏极的OLED导通，OLED的驱动电流IOLED＝K(VGS-Vth)2，其中Vth为DTFT本身的阈值电压，K为常数。由上述驱动电流公式可以看出，DTFT的阈值电压Vth会对流过OLED的驱动电流IOLED产生影响，而由于制造工艺的误差、器件老化等原因，会使各个像素单元中DTFT的阈值电压Vth产生漂移，对流过OLED的驱动电流造成偏差，进而影响显示效果。另一方面，随着显 示技术的急速进步，具有触控功能的显示装置由于其所具有的可视化操作等优点而逐渐得到越来越多人的欢迎。现有的一种OLED显示装置中，将OLED显示装置中OLED的阴极复用为触控电极使用，这样可以降低显示装置的整体厚度。在将阴极复用为触控电极时，需要在阴极上施加触控驱动信号，由于触控驱动信号的电压随时间变化，会导致流经OLED的电流发生变化，使得OLED的发光亮度随时间变化，影响发光显示。
发明内容
本公开的实施例提供一种像素驱动电路、显示面板及其驱动方法和显示装置，能够避免驱动晶体管的阈值电压漂移对有源发光器件驱动电流的影响，同时避免触控驱动信号的电压随时间变化对显示效果的影响。
为达到上述目的，本公开的实施例采用如下技术方案。
根据本公开的一个方面，提供一种像素驱动电路，包括：预置单元、驱动单元，补偿单元、储能单元和驱动信号输出单元，其中
所述储能单元连接第一节点和第二节点，用于存储所述第一节点和所述第二节点的电压；
所述预置单元连接第一电压端、第一节点、第二节点、第二扫描信号端和重置信号端，用于在所述第二扫描信号端的控制下将所述第一电压端的电压写入所述第一节点，并将所述重置信号端的电压写入所述第二节点；
所述补偿单元连接第三节点、第一节点、第二节点、数据信号端和第一扫描信号端，用于在所述第一扫描信号端的控制下将所述数据信号端的数据电压写入所述第一节点，并将所述第三节点的电压写入所述第二节点，直至将所述第二节点的电压补偿为第一电压端的电压与所述驱动单元的阈值电压之差为止；
所述驱动单元连接第一电压端、第二节点和第三节点，用于在所述第一电压端的电压与所述第二节点的电压的控制下向所述第三节点输出用于驱动所述像素驱动电路所连接的电致发光元件的驱动电流；以及
所述驱动信号输出单元连接所述第一节点、第三节点、参考信号端、第三扫描信号端和信号输出端，用于在所述第三扫描信号端的控制下将所述参考信号端的信号写入所述第一节点，并将所述第三节点的驱动电流输出至所述信号输出端。
可选地，所述预置单元包括：第一晶体管和第四晶体管，其中
所述第一晶体管的栅极连接所述第二扫描信号端，所述第一晶体管的第一端连接所述第一电压端，并且所述第一晶体管的第二端连接所述第一节点；以及
所述第四晶体管的栅极连接所述第二扫描信号端，所述第四晶体管的第一端连接所述重置信号端，并且所述第四晶体管的第二端连接所述第二节点。
可选地，所述储能单元包括：第一电容，其中
所述第一电容的第一端连接所述第一节点，并且所述第一电容的第二端连接所述第二节点。
可选地，所述驱动单元包括：驱动晶体管，其中
所述驱动晶体管的栅极连接所述第二节点，所述驱动晶体管的第一端连接所述第一电平端，并且所述驱动晶体管的第二端连接所述第三节点。
可选地，所述补偿单元包括：第三晶体管和第五晶体管，其中
所述第三晶体管的栅极连接所述第一扫描信号端，所述第三晶体管的第一端连接所述数据信号端，并且所述第三晶体管的第二端连接所述第一节点；以及
所述第五晶体管的栅极连接所述第一扫描信号端，所述第五晶体管的第一端连接所述第三节点，并且所述第五晶体管的第二端连接所述第二节点。
可选地，所述驱动信号输出单元包括：第二晶体管和第六晶体管，其中
所述第二晶体管的栅极连接所述第三扫描信号端，所述第二晶体管的第一端连接所述参考信号端，并且所述第二晶体管的第二端连接所述第一节点；以及
所述第六晶体管的栅极连接所述第三扫描信号端，所述第六晶体管的第一端连接所述第三节点，并且所述第六晶体管的第二端连接所述信号输出端。
根据本公开的另一个方面，提供一种显示面板，包括：基底、形成在所述基底上的电致发光元件阵列、用以驱动各个电致发光元件的像素驱动电路阵列、以及用于向所述像素驱动电路阵列提供显示驱动信号的多条显示驱动信号线，其中
所述像素驱动电路阵列中的像素驱动电路为如上述任一素驱动电路；所述电致发光元件阵列包括第一电极图形、第二电极图形和设置在所述第一电极图形和所述第二电极图形之间的电致发光层；并且所述第一电极图形包括多个第一电极，其中的每一个第一电极对应连接一个像素驱动电路的信号输出端。
可选地，所述显示面板还包括多条触控信号线，所述第二电极图形包括多个第二电极，每一个第二电极连接到一条触控信号线，并适于作为一个触控电极。
可选地，所述第二电极图形中的各个第二电极分为多行，奇数行的第二电极与偶数行的第二电极在列方向上交错；每一个的奇数行的各个第二电极连接到同一触控信号线；并且偶数行的各个第二电极中位于同一列的各个第二电极连接同一条触控信号线。
可选地，所述第一电极是所述电致发光元件的阳极，并且所述第二电极是所述电致发光元件的阴极。
根据本公开的又一个方面，提供一种如上述的显示面板的驱动方法，包括：
在第一阶段，预置单元在第二扫描信号端的控制下将第一电压端的电压写入所述第一节点，并将重置信号端的电压写入所述第二节点；
在第二阶段，补偿单元在所述第一扫描信号端的控制下将数据信号端的数据电压写入第一节点，并将第三节点的电压写入第二节点，直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差为止；以及
在第三阶段，驱动信号输出单元在所述第三扫描信号端的控制下将参考信号端的信号写入第一节点，驱动单元在第一电压端的电压与 所述第二节点的电压的控制下向第三节点输出用于驱动像素驱动电路所连接的电致发光元件的驱动电流；以及驱动信号输出单元将第三节点的驱动电流输出至信号输出端，其中
所述第三阶段包括触控时段，在所述触控时段中，在所述第二电极图形中的第二电极上施加触控驱动信号，其中在各条显示驱动信号线施加的显示驱动信号的电压与在触控信号线施加的触控驱动信号的电压的差值不随时间变化。
可选地，所述预置单元包括：第一晶体管和第四晶体管，其中
在第一阶段中，第一晶体管和第四晶体管在第二扫描信号端的控制下均为导通状态，将第一电压端的电压通过所述第一晶体管写入所述第一节点，并将重置信号端的电压通过所述第四晶体管写入所述第二节点。
可选地，所述补偿单元包括：第三晶体管和第五晶体管，其中
在第二阶段中，第三晶体管和第五晶体管在所述第一扫描信号端的控制下均处于导通状态，将数据信号端的数据电压通过所述第三晶体管写入第一节点，并将第三节点的电压通过所述第五晶体管写入第二节点，直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差为止。
可选地，所述驱动信号输出单元包括：第二晶体管和第六晶体管，其中
在第三阶段中，第二晶体管和第六晶体管在所述第三扫描信号端的控制下均处于导通状态，将参考信号端的信号通过所述第二晶体管写入第一节点，并且将第三节点的驱动电流通过所述第六晶体管输出至信号输出端。
根据本公开的又一个方面，一种显示装置，包括上述的显示面板。
本公开的实施例提供像素驱动电路、显示面板及其驱动方法和显示装置，由于补偿单元能够对驱动单元进行阈值电压补偿，因此避免了像素驱动电路中驱动单元的阈值电压漂移对驱动电流电流造成的影响，同时在触控时段在第二电极图形中的第二电极上施加触控驱动信号；并且由于在对包含上述的像素驱动电路的显示面板进行驱动时，在各条显示 驱动信号线施加的显示驱动信号的电压与在触控驱动信号的电压的差值不随时间变化，因此避免触控驱动信号的电压随时间变化对显示效果的影响。
附图说明
为了更清楚地说明本公开实施例或相关技术中的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本公开实施例提供的一种像素驱动电路结构示意图；
图2为本公开实施例提供的一种显示面板的结构示意图；
图3为本公开实施例提供的一种如图2所示的显示面板中第二电极与触控信号线的连接关系示意图；
图4为本公开实施例提供的像素驱动电路结构示意图；
图5为本公开实施例提供的如图4所示的像素驱动电路的输入信号的时序图；
图6为本公开实施例提供的如图4所示的像素驱动电路在t1阶段的等效电路示意图；
图7为本公开实施例提供的如图4所示的像素驱动电路在t2阶段的等效电路示意图；以及
图8为本公开实施例提供的如图4所示的像素驱动电路在t3阶段的等效电路示意图。
附图标记：
基底-10，缓冲层-11，有源层-12；掺杂的有源层-12a(12b)，栅绝缘层-13，栅极-14，层间绝缘层-15，漏极-16a，源极-16b，触控信号线-16c，平坦化层-17，第一电极-18a，第三电极-18b，像素限定层-19，电致发光层-20，第二电极-21，像素驱动电路-30；
预置单元-101，驱动单元-102，补偿单元-103，储能单元-104，驱动信号输出单元-105；
第一晶体管-T1，第二晶体管-T2，第三晶体管-T3，第四晶体管-T4，第五晶体管-T5，第六晶体管-T6，驱动晶体管-DTFT，电容-C，电致发光元件-OLED。
具体实施方式
为使本公开文本的实施例的目的、技术方案和优点更加清楚，下面将结合本公开文本的实施例的附图，对本公开文本的实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开文本的一部分实施例，而不是全部的实施例。基于所描述的本公开文本的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开文本保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开文本所属领域内具有一般技能的人士所理解的通常意义。本公开文本专利申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”或者“一”等类似词语也不表示数量限制，而是表示存在至少一个。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也相应地改变。
本公开所有实施例中采用的晶体管均可以为薄膜晶体管或场效应管或其他特性相同的器件，根据在电路中的作用本公开的实施例所采用的晶体管主要为开关晶体管。由于这里采用的开关晶体管的源极、漏极是对称的，所以其源极、漏极是可以互换的。在本公开实施例中，为区分晶体管除栅极之外的两极，将其中源极称为第一端，漏极称为第二端。按附图中的形态规定晶体管的中间端为栅极、信号输入端为源极、信号输出端为漏极。此外本公开实施例所采用的开关晶体管包括P型开关晶体管和N型开关晶体管两种，其中，P型开关晶体管在栅极为低电平时导通，在栅极为高电平时截止，N型开关晶体管为在栅极为高电平时导通，在栅极为低电平时截止；驱动晶体管包括P型 和N型，其中P型驱动晶体管在栅极电压为低电平(栅极电压小于源极电压)、且栅极源极的压差的绝对值大于阈值电压时处于放大状态或饱和状态；以及N型驱动晶体管的栅极电压为高电平(栅极电压大于源极电压)、且栅极源极的压差的绝对值大于阈值电压时处于放大状态或饱和状态。
参照图1所示，本公开的实施例提供一种像素驱动电路，包括：预置单元101、驱动单元102、补偿单元103、储能单元104和驱动信号输出单元105，其中
所储能单元104连接第一节点a和第二节点b，用于存储第一节点a和第二节点b的电压；
所预置单元101连接第一电压端V1、第一节点a、第二节点b、第二扫描信号端S2和重置信号端INT，用于在第二扫描信号端S2的控制下将第一电压端V1的电压写入第一节点a，并将重置信号端INT的电压写入第二节点b；
补偿单元103连接第三节点c、第一节点a、第二节点b、数据信号端Data和第一扫描信号端S1，用于在第一扫描信号端S1的控制下将数据信号端Data的数据电压写入所述第一节点a，并将第三节点c的电压写入所述第二节点b，直至将第二节点b的电压补偿为第一电压端V1的电压与驱动单元12的阈值电压之差；
驱动单元102连接第一电压端V1、第二节点b和第三节点c，用于在第一电压端V1的电压与所述第二节点b的电压的控制下向第三节点c输出用于驱动所述像素驱动电路所连接的电致发光元件的驱动电流；
驱动信号输出单元105连接第一节点a、第三节点c、参考信号端REF、第三扫描信号端S3和信号输出端OUT，用于在第三扫描信号端S3的控制下将参考信号端REF的信号写入第一节点a，并将第三节点c的驱动电流输出至信号输出端OUT。
本公开的实施例提供一种显示面板，包括基底、形成在基底上的电致发光元件阵列、用以驱动各个电致发光元件的像素驱动电路阵列以及用于向像素驱动电路阵列提供显示驱动信号的多条显示驱动信号线；
像素驱动电路阵列中的像素驱动电路为如上述像素驱动电路；电致发光元件阵列包括第一电极图形、第二电极图形和设置在第一电极图形和第二电极图形之间的电致发光层；第一电极图形包括多个第一电极，其中的每一个第一电极对应连接一个像素驱动电路的信号输出端；
显示面板还包括多条触控信号线，第二电极图形包括多个第二电极，每一个第二电极连接到一条触控信号线，适于作为一个触控电极。
可选地，第二电极图形中的各个第二电极分为多行，奇数行的第二电极与偶数行的第二电极在列方向上交错；每一个的奇数行的各个第二电极连接到同一触控信号线；偶数行的各个第二电极中位于同一列的各个第二电极连接同一条触控信号线。
本公开的实施例还提供一种如上述的显示面板的驱动方法，包括如下三个阶段：
第一阶段，预置单元在第二扫描信号端的控制下将第一电压端的电压写入第一节点，并将重置信号端的电压写入第二节点；
第二阶段，补偿单元在第一扫描信号端的控制下将数据信号端的数据电压写入第一节点，并将第三节点的电压写入第二节点，直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差为止；
第三阶段，驱动信号输出单元在第三扫描信号端的控制下将参考信号端的信号写入第一节点，驱动单元在第一电压端的电压与第二节点的电压控制下向第三节点输出用于驱动像素驱动电路所连接的电致发光元件的驱动电流；驱动信号输出单元将第三节点的驱动电流输出至信号输出端；
第三阶段包括触控时段，在第二电极图形中的第二电极上施加触控驱动信号；其中，在各条显示驱动信号线施加的显示驱动信号的电压与在触控信号线施加的触控驱动信号的电压的差值不随时间变化。
对这样的显示面板进行驱动时，上述的第三阶段驱动电致发光元件发光，该第三阶段包括触控时段，此时该方法中，在第三阶段中的触控时段，在各条显示驱动信号线分别对应连接像素驱动电路的各个信号端，在各条显示驱动信号线施加对应的显示驱动信号的电压与在 触控信号线施加的触控驱动信号线施加的触控驱动信号的电压的差值为恒定值。
这样能够降低因第二电极与各条显示驱动信号线之间的电容造成的触控驱动信号在第二电极上的传输时对各条显示驱动信号线上电压的影响。具体来说，可以在该触控时段，使在每一条显示驱动信号线上施加的显示驱动信号具有一定的电压波动，该电压波动与施加在第二电极上的触控驱动信号的电压变化同步，且波动电压的幅值与触控驱动信号的电压变化相同，这样就使得显示驱动信号的电压与触控驱动信号的电压的差值为恒定值，从而避免第二电极与各条显示驱动信号线的电容变化，保证了第三阶段像素驱动电路向电致发光元件输出恒定的驱动电流。
这样，由于补偿单元能够对驱动单元进行阈值电压补偿，避免了像素驱动电路中驱动单元的阈值电压漂移对驱动电流造成的影响，同时在触控时段在第二电极图形中的第二电极上施加触控驱动信号；并且在对包含上述的像素驱动电路的显示面板进行驱动时，在各条显示驱动信号线上施加的显示驱动信号的电压与在触控驱动信号上的电压的差值不随时间变化，因此避免触控驱动信号的电压随时间变化对显示效果的影响。
在具体实施时，上述的显示面板的具体结构可以有多种，比如其中的像素驱动电路可以表现为多种不同的形式，具体的驱动方法也不尽相同。下面结合附图进行举例说明。
在具体实施时，显示面板上的电致发光单元阵列包括多个电致发光元件、相应的该电致发光单元阵列的第一电极图形会包含相应数量个第一电极，每一个电致发光元件的第一电极对应连接一个像素驱动电路，在像素驱动电路的驱动下进行发光显示，一个电致发光元件和一个像素驱动电路构成一个像素单位；另外在显示面板上还会形成有用于控制各个像素驱动电路的多条显示驱动信号线。不难理解的是，由于触控精度的要求低于像素的分辨率，作为触控电极的第二电极图形中的各个第二电极的大小不必与一个像素单位相适应，也就是说，多个像素单位可以共用一个第二电极。参见图2，为本公开提供的显示面板一个像素单位的结构示意图，包括：基底10、形成在基底10上的 第一电极18a、第二电极21以及在第一电极18a和第二电极21之间的电致发光层20。第一电极18a与其上方的第二电极21、电致发光层20共同实现电致发光。该像素单位还包括与第一电极18a相连的像素驱动电路30，其中图2中仅示出像素驱动电路中的一个晶体管(与电致发光器件相连的晶体管)的结构。当然可以理解的是，像素驱动电路的其他器件均可以采用现有的构图工艺制作于基底10之上，其中该晶体管为一顶栅型晶体管，包括有源层12，掺杂的有源层12a、12b，栅绝缘层13，栅极14，层间绝缘层15，漏极16a，源极16b。此外，图2中还示出了缓冲层11，与第二电极21相连的触控信号线16c、平坦化层17、以及像素限定层19。此外，平坦化层17上还设置有通过过孔与触控信号线16c相连的第三电极18b，其中第一电极18a通过平坦化层17上的过孔与漏极16a连接，第二电极21通过像素限定层19的过孔与第三电极18b相连，上述各个结构中，第一电极18a和第三电极18b同层形成，漏极16a、源极16b和触控信号线16c同层形成。参见图3，为第二电极图形中的各个第二电极21与触控信号线16c的连接关系图，奇数行的第二电极21和偶数行的第二电极21的位置交错，每一个奇数行内的各个第二电极21连接到在同一行方向上的触控信号线16c上，而各个偶数行的第二电极21中的每一列第二电极21连接到在同一列方向上的触控信号线16c上。在具体应用时，当手指触摸到任一个位置时，会导致邻近该位置的各个第二电极21(包括连接到列方向上的触控信号线16c上的第二电极21和连接到行方向上的触控信号线16c上的第二电极21)上存储的电荷发生变化，这样的变化可以被连接这些第二电极21的触控信号线16c检测到，进而确定触控位置。
一般地，这里的第一电极18a为电致发光元件的阳极，第二电极21为电致发光元件的阴极。在本公开实施例中，通过复用电致发光元件阵列的阴极作为触控电极，能够避免单独地制作触控电极，利于降低显示装置的盒厚。
在具体实施时，这里的触控信号线可以在制作像素驱动电路中的各个元件(比如电容、晶体管等)时同时制作。进一步地，在一些情况下，上述的像素驱动电路和第一电极图形以及电致发光层可以制作在背板上，而第二电极图形则可以制作在盖板上，此时可以将触控信 号线制作在背板上。
参考图4，在具体实施时，构成上述像素驱动电路30的各个单元的具体结构描述如下：像素驱动电路30包括T1-T6共6个P型开关晶体管以及一个P型驱动晶体管DTFT和一个电容C，该像素驱动电路30与电致发光元件OLED的阳极相连。对应地，上述的显示面板包括：向各个信号端提供信号的信号线。
预置单元101包括：第一晶体管T1和第四晶体管T4；
第一晶体管T1的栅极连接第二扫描信号端S2、第一晶体管T1的第一端连接第一电压端V1、第一晶体管T1的第二端连接第一节点a；第四晶体管T4的栅极连接第二扫描信号端S2，第四晶体管T4的第一端连接INT，第四晶体管T4的第二端连接第二节点b。
储能单元104包括：第一电容C；
第一电容C的第一端连接第一节点a，第一电容C的第二端连接第二节点b。
驱动单元12包括：驱动晶体管DTFT；
驱动晶体管DTFT的栅极连接第二节点b，驱动晶体管DTFT的第一端连接第一电平端V1；驱动晶体管DTFT的第二端连接第三节点c。
补偿单元103包括：第三晶体管T3和第五晶体管T5；
第三晶体管T3的栅极连接第一扫描信号端S1，第三晶体管T3的第一端连接数据信号端Data，第三晶体管T3的第二端连接第一节点a；第五晶体管T5的栅极连接第一扫描信号端S1，第五晶体管T5的第一端连接第三节点c，第五晶体管T5的第二端连接第二节点b。
驱动信号输出单元105包括：第二晶体管T2和第六晶体管T6；
第二晶体管T2的栅极连接第三扫描信号端S3，第二晶体管T2的第一端连接参考信号端REF，第二晶体管T2的第二端连接第一节点a；第六晶体管T6的栅极连接第三扫描信号端S3，第六晶体管T6的第一端连接第三节点c，第六晶体管T6的第二端连接信号输出端OUT。
其中，上述显示面板中的像素电路包括以上具体器件结构时，上述显示面板的驱动方法还包括以下方式：
可选地，预置单元包括：第一晶体管和第四晶体管；
第一阶段，第一晶体管和第四晶体管在第二扫描信号端的控制下均为导通状态，将第一电压端的电压通过第一晶体管写入第一节点，并将重置信号端的电压通过第四晶体管写入第二节点；
可选地，补偿单元包括：第三晶体管和第五晶体管；
第二阶段，第三晶体管和第五晶体管在第一扫描信号端的控制下均处于导通状态，将数据信号端的数据电压通过第三晶体管写入第一节点，并将第三节点的电压通过第五晶体管写入第二节点，直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差为止；
可选地，驱动信号输出单元包括：第二晶体管和第六晶体管；
第三阶段，第二晶体管和第六晶体管在第三扫描信号端的控制下均处于导通状态，将参考信号端的信号通过第二晶体管写入第一节点，将第三节点的驱动电流通过第六晶体管输出至信号输出端。
本公开实施例所提供的显示面板中的像素驱动电路通过合适的驱动方法能够避免驱动晶体管的阈值漂移对发光显示造成的影响并能避免施加在阴极上的触控驱动信号对发光显示的影响，下面结合图5-8对图4中的像素驱动电路的工作原理进行说明。
这里以各个晶体管均为“P”型晶体管为例进行说明，V1端为高电平VDD信号，信号输出端OUT连接至电致发光器件(以OLED为例)的阳极，电致发光器件的阴极连接的V2端为低电平VSS。参照图4提供的像素驱动电路，图5提供的像素驱动电路的输入信号时序状态示意图，同时参照图6～8所提供的像素驱动电路的各个阶段工作状态的等效电路示意图，则显示面板的工作原理分成四个部分，分别是第一阶段t1的预置阶段，第二阶段t2的阈值电压和数据写入阶段，第三阶段t3是发光阶段，其中t3阶段中包含δt触控时段。其中以下实施例中具体结合图6～8所示的等效电路图进行说明，各个附图中采用实线表示导通的晶体管及线路，虚线表示未导通的晶体管及线路。
第一阶段t1，S1＝1，S2＝0，S3＝1，需要说明的是，以下实施例中，“0”表示低电平；“1”表示高电平。参照图6所示的等效电路图，S1、S3为高压截止信号，S2为低压导通信号状态。此时T1、T4导通，节点b通过重置信号端INT将电压重置为Vint，节点a电压重置为VDD， 之后电容C保持节点a和节点b的电压差，由于Vint为低电平从而使得DTFT导通，并且由于电容C能保持节点a和节点b的电压差从而使得下一个阶段一开始DTFT就处于导通状态，为进行阈值补偿做准备。
第二阶段t2，S1＝0，S2＝1，S3＝1。参照图7所示的等效电路图，S2、S3为高压截止信号，S1为低压导通信号状态。此时T3、T5导通，数据信号端Data通过T3对节点a充电，直至节点a的电压变化为Vdata，由于T5导通，DTFT的栅极和漏极短接相当于二极管，而b点电势充电为VDD-Vth(满足DTTF栅源之间的压差为Vth)，此时电容C两端的电势差为VDD-Vth-Vdata，并为下一阶段作准备。
第三阶段t3，S1＝1，S2＝1，S3＝0。参照图8所示的等效电路图，S1、S2为高压截止信号，S3为低压导通信号状态。此时T2、T6导通，参考信号端REF对节点a充电值Vref，节点b发生电压跳变至VDD-Vth-Vdata+Vref，时序图中t3为像素正式发光阶段，此时的发光阶段DTFT源极的电压为VDD，电流通过DTFT和T6使得OLED开始发光。
由DTFT饱和电流公式可以得到：
IOLED＝K(VGS-Vth)2
＝K[VDD-[VDD-Vth-Vdata+Vref]-Vth]2
＝K(Vdata-Vref)2
由上式中可以看到此时工作电流IOLED已经不受Vth的影响。彻底解决了驱动TFT由于工艺制程及长时间的操作造成阈值电压(Vth)漂移的问题，消除其对IOLED的影响，保证OLED的正常工作。
在第三阶段t3中的δt触控时段，除了阴极电极(第二电极即触控电极)输入触控驱动信号开始驱动以外，其他的显示驱动信号线与触控电极都一起进行驱动，保证原来所有的TFT开关都保持原来的开关状态。同时也不影响OLED输出电流的大小，因为a点在整个发光阶段数据信号已经写入，由于VDD电压及其他显示驱动信号线的电压都随触控电极的触控驱动信号一起跳变，包括Vint电压，a点处于浮接(Floating) 状态，也会跟着Vint点进行跳变。因此对末端输出的电流IOLED没有影响。
另外不难理解的是，本实施例中将各个晶体管均设置为P型晶体管可以降低制作难度，但是在实际应用中，上述的各个晶体管的类型可以进行一定的调整，相应的技术方案也能够达到本公开的基本目的，应落入本公开的保护范围。
本公开还提供了一种显示装置，包括上述任一项所述的显示基板。
这里的显示装置可以为：电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (15)

  1. 一种像素驱动电路，包括：预置单元、驱动单元，补偿单元、储能单元和驱动信号输出单元，其中
    所述储能单元连接第一节点和第二节点，用于存储所述第一节点和所述第二节点的电压；
    所述预置单元连接第一电压端、第一节点、第二节点、第二扫描信号端和重置信号端，用于在所述第二扫描信号端的控制下将所述第一电压端的电压写入所述第一节点，并将所述重置信号端的电压写入所述第二节点；
    所述补偿单元连接第三节点、第一节点、第二节点、数据信号端和第一扫描信号端，用于在所述第一扫描信号端的控制下将所述数据信号端的数据电压写入所述第一节点，并将所述第三节点的电压写入所述第二节点，直至将所述第二节点的电压补偿为第一电压端的电压与所述驱动单元的阈值电压之差为止；
    所述驱动单元连接第一电压端、第二节点和第三节点，用于在所述第一电压端的电压与所述第二节点的电压的控制下向所述第三节点输出用于驱动所述像素驱动电路所连接的电致发光元件的驱动电流；以及
    所述驱动信号输出单元连接所述第一节点、第三节点、参考信号端、第三扫描信号端和信号输出端，用于在所述第三扫描信号端的控制下将所述参考信号端的信号写入所述第一节点，并将所述第三节点的驱动电流输出至所述信号输出端。
  2. 根据权利要求1所述的像素驱动电路，其中所述预置单元包括：第一晶体管和第四晶体管，其中
    所述第一晶体管的栅极连接所述第二扫描信号端，所述第一晶体管的第一端连接所述第一电压端，并且所述第一晶体管的第二端连接所述第一节点；以及
    所述第四晶体管的栅极连接所述第二扫描信号端，所述第四晶体管的第一端连接所述重置信号端，并且所述第四晶体管的第二端连接所述 第二节点。
  3. 根据权利要求1所述的像素驱动电路，其中所述储能单元包括：第一电容，其中
    所述第一电容的第一端连接所述第一节点，并且所述第一电容的第二端连接所述第二节点。
  4. 根据权利要求1所述的像素驱动电路，其中所述驱动单元包括：驱动晶体管，其中
    所述驱动晶体管的栅极连接所述第二节点，所述驱动晶体管的第一端连接所述第一电平端，并且所述驱动晶体管的第二端连接所述第三节点。
  5. 根据权利要求1所述的像素驱动电路，其中所述补偿单元包括：第三晶体管和第五晶体管，其中
    所述第三晶体管的栅极连接所述第一扫描信号端，所述第三晶体管的第一端连接所述数据信号端，并且所述第三晶体管的第二端连接所述第一节点；以及
    所述第五晶体管的栅极连接所述第一扫描信号端，所述第五晶体管的第一端连接所述第三节点，并且所述第五晶体管的第二端连接所述第二节点。
  6. 根据权利要求1所述的像素驱动电路，其中所述驱动信号输出单元包括：第二晶体管和第六晶体管，其中
    所述第二晶体管的栅极连接所述第三扫描信号端，所述第二晶体管的第一端连接所述参考信号端，并且所述第二晶体管的第二端连接所述第一节点；以及
    所述第六晶体管的栅极连接所述第三扫描信号端，所述第六晶体管的第一端连接所述第三节点，并且所述第六晶体管的第二端连接所述信号输出端。
  7. 一种显示面板，包括：基底、形成在所述基底上的电致发光元件阵列、用以驱动各个电致发光元件的像素驱动电路阵列、以及用于向所述像素驱动电路阵列提供显示驱动信号的多条显示驱动信号线，其中
    所述像素驱动电路阵列中的像素驱动电路为如权利要求1-6中任一项所述的像素驱动电路；所述电致发光元件阵列包括第一电极图形、第二电极图形和设置在所述第一电极图形和所述第二电极图形之间的电致发光层；并且所述第一电极图形包括多个第一电极，其中的每一个第一电极对应连接一个像素驱动电路的信号输出端。
  8. 根据权利要求7所述的显示面板，其中所述显示面板还包括多条触控信号线，所述第二电极图形包括多个第二电极，每一个第二电极连接到一条触控信号线，并适于作为一个触控电极。
  9. 根据权利要求8所述的显示面板，其中所述第二电极图形中的各个第二电极分为多行，奇数行的第二电极与偶数行的第二电极在列方向上交错；每一个的奇数行的各个第二电极连接到同一触控信号线；并且偶数行的各个第二电极中位于同一列的各个第二电极连接同一条触控信号线。
  10. 根据权利要求8所述的显示面板，其中，所述第一电极是所述电致发光元件的阳极，并且所述第二电极是所述电致发光元件的阴极。
  11. 一种如权利要求7-10中任一项所述的显示面板的驱动方法，包括：
    在第一阶段，预置单元在第二扫描信号端的控制下将第一电压端的电压写入第一节点，并将重置信号端的电压写入第二节点；
    在第二阶段，补偿单元在所述第一扫描信号端的控制下将数据信号端的数据电压写入第一节点，并将第三节点的电压写入第二节点，直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差为止；以及
    在第三阶段，驱动信号输出单元在所述第三扫描信号端的控制下将参考信号端的信号写入第一节点，驱动单元在第一电压端的电压与所述第二节点的电压的控制下向第三节点输出用于驱动像素驱动电路所连接的电致发光元件的驱动电流，以及驱动信号输出单元将第三节点的驱动电流输出至信号输出端，其中
    所述第三阶段包括触控时段，在所述触控时段中，在所述第二电极 图形中的第二电极上施加触控驱动信号，其中在各条显示驱动信号线施加的显示驱动信号的电压与在触控信号线施加的触控驱动信号的电压的差值不随时间变化。
  12. 根据权利要求11所述的方法，其中所述预置单元包括：第一晶体管和第四晶体管，其中
    在所述第一阶段中，第一晶体管和第四晶体管在第二扫描信号端的控制下均为导通状态，将第一电压端的电压通过所述第一晶体管写入所述第一节点，并将重置信号端的电压通过所述第四晶体管写入所述第二节点。
  13. 根据权利要求11所述的方法，其中所述补偿单元包括：第三晶体管和第五晶体管，其中
    在所述第二阶段中，第三晶体管和第五晶体管在所述第一扫描信号端的控制下均处于导通状态，将数据信号端的数据电压通过所述第三晶体管写入第一节点，并将第三节点的电压通过所述第五晶体管写入第二节点，直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差为止。
  14. 根据权利要求11所述的方法，其中所述驱动信号输出单元包括：第二晶体管和第六晶体管，其中
    在所述第三阶段中，第二晶体管和第六晶体管在所述第三扫描信号端的控制下均处于导通状态，将参考信号端的信号通过所述第二晶体管写入第一节点，并且将第三节点的驱动电流通过所述第六晶体管输出至信号输出端。
  15. 一种显示装置，包括如权利要求7-10中任一项所述的显示面板。
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